Lin-Manuel Miranda on The Tonight Show Starring Jimmy Fallon on Dec. 17, 2018.

Lin-Manuel Miranda and Jimmy Fallon spread some holiday cheer to The Tonight Show on Monday night (Dec. 17) by cycling through festive renditions of 2018's biggest pop songs. The pair also chatted their viral "Two Goats on a Boat" video, Miranda's role in Mary Poppins Returns and their big plans to stage Hamilton in Puerto Rico.

Fallon opened by talking about how he loves singing holiday songs, instantly summoning Miranda to come out from behind the curtains. Fallon asked, “Are you saying that we should sing a medley of popular songs from 2018 but change the lyrics to make them about the holiday season?” Miranda, of course, replied with confidence: “Yes."

The pair opened with a song about mall Santas set to the tune of Camila Cabello’s “Havana,” followed it with a jam about eating too much holiday food set to “Girls Like You” by Maroon 5 and then added a few lines about sipping egg nog backed by the sound of Migos’ “Stir Fry.”

“This year I got a gift card to Dunkin’,” they sang to “In My Blood” by Shawn Mendes, “I said that it had twenty bucks but it had three/ My Secret Santa sucks!/ My Secret Santa sucks!”

After hitting the Christmas card version of Ed Sheeran’s “Perfect” and an Elf on the Shelf rendition of Bebe Rexha’s “Meant to Be,” Miranda and Fallon closed with Cardi B’s “I Like It”: “Puttin’ presents by the tree (I said I like it like that)/ Can’t believe it’s Christmas Day (I said I like it like that).”

When they finally sat down, Fallon ran through all of Miranda’s 2018 accomplishments: He had a second baby boy, won a Grammy Award for best song written for visual media for “How Far I’ll Go” from Moana, got an Emmy nomination for best guest actor in a comedy in Curb Your Enthusiasm, published a New York Times best selling book (Gmorning, Gnight!), got a star on the Hollywood Walk of Fame, received a Kennedy Center honor along the Hamilton team and got a Golden Globe nomination for Mary Poppins Returns.

“Wait,” Miranda halted the applause. “You’re forgetting the most important thing I did this year: two goats on a boat.” Earlier this year, Miranda and Fallon created a viral Instagram video of the two canoeing and singing together. They explained how it went down.

“I got a text that said, ‘Do you want to sing to goats on a boat? I’ll shave my face to make a goatee?’” said Miranda, “And I thought it was like a song that already existed, and I said, 'I don’t know what you’re saying, but yes.'”

Fallon pulled out a printed screen grab from their text conversation, showing that Miranda’s exact reply was, “Wtf is 2 goats on a boat? I mean I’m in.” Their wives filmed them, but quickly grew tired of the endless re-takes.

The two also talked about Miranda’s leading role in Mary Poppins Returns, set 25 years after the original Mary Poppins. “The dancing was fine, like I have danced before," said Miranda of the experience. "I have never ridden a bike with a Cockney accent down British cobble stone while stealing an apple to give to an orphan and lighting a lamp.”

Miranda closed out his appearance by touching on the complications of reprising the leading Hamilton role for the first time in two and a half years for the upcoming three-week tour in Puerto Rico. “Imagine like your computer’s just like a messy desktop… It’s all there, I never hit empty trash, but I have like old drafts in my head,” he explained. “My problem’s different from everyone else’s problem, which is I have every version of every line I wrote in my head.”